Abstract
In separate experiments, microbial-free compressed air carried individual C 6, C 7, C 8, C 9, C 10-alkenals and alkanals into enclosed systems containing artificially wounded and non-wounded Acala SJ-2 developing cotton boils. Two days after treatment, discs were excised from the treated cotton bolls surfaces and were extracted to determine the induction of the sesquiterpenoid naphthol phytoalexins, 2,7-dihydroxycadelene and 2-hydroxy-7-methoxy cadalene, their oxidation products lacinilene C and lacinilene C 7-methyl ether, and the coumarin phytoalexin scopoletin. Highest concentrations of the described phytoalexins were elicited by C 6C 10 alkenals in artificially wounded cotton bolls. C 6C 10 alkenals may function as volatile elicitors of a defence response in the cotton plant.
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